Fix badge job: force Node.js 24 for deprecated node20 action

[Copilot]

Description

The badge CI job was failing with HttpError: Requires authentication (HTTP 401) from within manics/action-binderbadge@v3.0.0. The action bundles @actions/github@6.0.0 → @octokit/request@9, which uses Node.js native fetch (unstable in Node.js 20). Newer GitHub-hosted runner images expose this instability, causing auth headers to be silently dropped.

Fix

Added FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true to the badge job env in binder-badge.yml — the explicit GitHub-recommended migration path for node20 actions ahead of the forced June 16, 2026 cutover.

jobs:
  badge:
    env:
      FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true

No upstream fix is available (manics/action-binderbadge has no node24 release); this env var resolves the issue without forking the action.

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[github-actions]

👈 Launch a binder notebook on this branch for commit ecd63bf

I will automatically update this comment whenever this PR is modified